What causes heart discomfort after waking up from a nightmare, and what should I do about it?

 　　Waking up from a nightmare with heart discomfort may be caused by physiological factors, or pathological conditions such as cardiac neurosis or arrhythmia. Treatment can be carried out through general management or medication. Specific details are as follows:
　　I. Physiological Factors
　　After experiencing a nightmare, autonomic nervous system dysfunction may occur, leading to feelings of fear and palpitations. Usually, no special treatment is required—symptoms can be relieved with adequate rest.
　　II. Pathological Factors
　　1. Cardiac Neurosis
　　This condition is mainly associated with stress, anxiety, and autonomic nervous system dysfunction. Symptoms may include chest tightness, shortness of breath, and chest pain. Under medical guidance, medications such as compound diazepam tablets or escitalopram oxalate tablets can be used for treatment.
　　2. Arrhythmia
　　Primarily caused by abnormalities in the origin of cardiac electrical activity or conduction disturbances, this condition may lead to abnormal heart rate or rhythm, resulting in cardiac discomfort. Medications such as propafenone hydrochloride tablets or propranolol hydrochloride tablets may be taken according to medical advice.
　　In addition to the above causes, heart discomfort could also result from angina pectoris, myocardial infarction, or heart failure. It is important to maintain a positive mental state and avoid emotional excitement.